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A FOXA1-binding enhancer regulates Hoxb13 expression in the prostate gland
Ryan P McMullin1, Albert Dobi, Laura N Mutton
1Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD 21250, USA.
Summary
Hoxb13 gene expression in the prostate is regulated by a conserved enhancer element. This element, bound by FOXA1, is crucial for prostate-specific transcription, even during cancer progression.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- Hoxb13 is highly expressed in the prostate, colon, and rectum.
- Prostate Hoxb13 transcription remains active despite androgen deprivation and during cancer progression.
Purpose of the Study:
- To identify the molecular mechanisms driving prostate-specific Hoxb13 gene transcription.
- To investigate regulatory elements controlling Hoxb13 expression in the prostate.
Main Methods:
- Bacterial artificial chromosome (BAC)-based reporter gene deletion analysis in transgenic mice.
- Bioinformatic analysis to identify conserved regulatory elements.
- Chromatin immunoprecipitation (ChIP) assay in human prostate cancer cells.
Main Results:
- Two downstream regions of Hoxb13 were identified as essential for prostate transcriptional activity, but not for colon or rectal expression.
- A conserved 37-bp mammalian element with potential FOXA1 binding sites was found.
- Deletion of this enhancer element in mice significantly reduced Hoxb13 transcription in the prostate.
Conclusions:
- FOXA1 directly regulates HOXB13 transcription in human prostate epithelial cells.
- A conserved regulatory mechanism involving FOXA1 controls prostate-specific Hoxb13 expression in both humans and mice.
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